VEGA VEGAPULS 56K - Manual (Page 33)

VEGAPULS 56K 33
22915-EN-041227
2
- +
4 ... 20 mA
2
4
2
2
> 250
Ω
1)
Measuring system with VEGAPULS 56K in four-wire technology
• Four-wire technology, power supply and output signal via two separate two-wire cables.
• Output signal 4 … 20 mA active.
• Optional external indicating instrument with analogue and digital indication (can be mounted
up to 25 m away from the sensor).
• Adjustment with PC, HART ® handheld or adjustment module MINICOM (can be plugged into
the sensor or into the indicating instrument VEGADIS 50)
• Max. load 500
Ω
Electrical connection
active 2)
VEGADIS 50
1) If the resistance of the processing
systems connected to the
4 … 20 mA signal output is less
than 200
Ω, a resistor must be
connected to the connection cable
during adjustment to get a loop
resistance of 250
Ω up to 350 Ω .
The digital adjustment signal would
otherwise be severely damped or
short-circuited due to insufficient
resistance of the connected
processing system. Digital
communication with the PC would
not be ensured.
2) 4 … 20 mA active means that the
sensor delivers a level-dependent
current of 4 … 20 mA (source).
The sensor reacts electrically in
the processing system (e.g.
indication) like a current source.
HART ® handheld
VEGA-
CONNECT 2